main.cpp

#include <Arduino.h>

// WIFI & MQTT
#include <ESP8266WiFi.h>
#include <PubSubClient.h>

// #define SID "Wif1456"
// #define PS "zxasqw12"
#define SID "PALETTE-AP"
#define PS "zxasqw12"

const char* ssid = SID;
const char* pswd = PS;
const char* mqtt_server = "192.168.0.100"; // Laptop
const char* topic = "rfid";    // rhis is the [root topic]

long timeBetweenMessages = 1000 * 20 * 1;

WiFiClient espClient;
PubSubClient client(espClient);
int value = 0;

int status = WL_IDLE_STATUS;     // the starting Wifi radio's status


// RFID
#include <SPI.h>
#include <MFRC522.h>
#define SS_PIN D2  // sda pin d2
#define RST_PIN D3 // reset pin d3

MFRC522 mfrc522(SS_PIN, RST_PIN);
String lastContent = "";


// ANTARES
// #include <AntaresESP8266HTTP.h>
// #define AK "1100e6c0fa6293e3:ca9a30127821b866"
// #define PRJ "RFID01"
// #define DEV "pallet1"
// AntaresESP8266HTTP antares(AK);

void setupRfid() {
  SPI.begin();
  mfrc522.PCD_Init();
  Serial.println();
  Serial.println("Dekatkan Tag RFID (Dapat berupa kartu atau gantungan kunci) ke RFID reader");
  Serial.println();
}

void setupAntares() {
  // // conect wifi
  // // Serial.begin(115200);
  // antares.setDebug(false);
  // antares.wifiConnection(SID, PS);
}

void setupWifi() {
  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, pswd);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();

  // Switch on the LED if an 1 was received as first character
  if ((char)payload[0] == '1') {
    digitalWrite(LED_BUILTIN, LOW);   // Turn the LED on (Note that LOW is the voltage level
    // but actually the LED is on; this is because
    // it is acive low on the ESP-01)
  } else {
    digitalWrite(LED_BUILTIN, HIGH);  // Turn the LED off by making the voltage HIGH
  }
}


String macToStr(const uint8_t* mac)
{
  String result;
  for (int i = 0; i < 6; ++i) {
    result += String(mac[i], 16);
    if (i < 5)
      result += ':';
  }
  return result;
}

String composeClientID() {
  // uint8_t mac[6];
  // WiFi.macAddress(mac);
  // String clientId;
  // clientId += "esp-";
  // clientId += macToStr(mac);
  // return clientId;
  String ipAddress = WiFi.localIP().toString();
  ipAddress.replace(".", ":");
  return ipAddress;
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");

    String clientId = composeClientID() ;
    clientId += "-";
    clientId += String(micros() & 0xff, 16); // to randomise. sort of

    // Attempt to connect
    if (client.connect(clientId.c_str())) {
      Serial.println("connected");
      // Once connected, publish an announcement...
      client.publish(topic, ("connected " + composeClientID()).c_str() , true );
      // ... and resubscribe
      // topic + clientID + in
      String subscription;
      subscription += topic;
      subscription += "/";
      subscription += composeClientID() ;
      subscription += "/in";
      client.subscribe(subscription.c_str() );
      Serial.print("subscribed to : ");
      Serial.println(subscription);
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.print(" wifi=");
      Serial.print(WiFi.status());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void publishData(String content, int time) 
{
  // Notifikasi LED / Buzzer
  if (lastContent != content) {
    digitalWrite(LED_BUILTIN, LOW);
    delay(time);
    digitalWrite(LED_BUILTIN, HIGH);
  }

  // // Kirim Data
  // antares.add("UID", content);
  // antares.send(PRJ, DEV);

  long now = millis();
  
  // if (now - lastMsg > timeBetweenMessages ) {
  //   lastMsg = now;
  //   ++value;
    String payload = "{\"micros\":";
    payload += micros();
    payload += ",\"val\":\"";
    payload += content;
    payload += "\",\"client\":\"";
    payload += composeClientID();
    payload += "\"}";
    String pubTopic;
    pubTopic += topic ;
    pubTopic += "/";
    pubTopic += composeClientID();
    pubTopic += "/out";
    client.publish( (char*) pubTopic.c_str() , (char*) payload.c_str(), true );
    Serial.print("Publish to: ");
    Serial.println(pubTopic);

    lastContent = content;
  // }

}

void setup()
{
  pinMode(LED_BUILTIN, OUTPUT);
  Serial.begin(9600);

  // digitalWrite(LED_BUILTIN, HIGH);

  setupRfid();
  
  setupWifi();

  // Connect MQTT
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);

  
  publishData("", 10);
}

int countBlank = 0;

void loop()
{

    // confirm still connected to mqtt server
  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  digitalWrite(LED_BUILTIN, HIGH);

  if (!mfrc522.PICC_IsNewCardPresent()) {
    // Tricky karena walaupun card masih nempel, tapi ada kebaca kosong 1x, https://github.com/miguelbalboa/rfid/issues/188
    countBlank++;
    // Serial.println("E0" + String(countBlank));
    if (lastContent != "" && countBlank > 2) {
      // countBlank = 0;
      publishData("", 10);
    }
    return;
  } else if (!mfrc522.PICC_ReadCardSerial()) {
    // Never called
    Serial.println("S_1");
    delay(1000);
    return;
  }

   countBlank = 0;

  String content = "";

  for (int i = 0; i < mfrc522.uid.size; i++)
  {
    // Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
    // Serial.print(mfrc522.uid.uidByte[i], DEC);
    //content.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "));
    content.concat(String(mfrc522.uid.uidByte[i], DEC));
  }

  publishData(content, 1000);

  delay(1000);
}